How does the spirit humiliate scrooge where tiny tim is concerned?

Scrooge is humiliated when he sees that Tiny Tim has to walk with a crutch. He realizes the child is in bad health, and the reader starts to see that Scrooge is able to feel true compassion for others. Both the present and future spirit foretell that Tiny Tim will likely die because of his poor health, leaving Scrooge feeling guilty that he did not care for the boy earlier.